I'm reaally worried that Miyagi is just lying to the MC so he doesn't have regrets, aka telling him not to contact Himeno because they might have been happy, etc.
I'm starting to fear he had a really fulfilling life ahead of him and he was given a super low quote to discourage him from selling it :(((
edit: ok continued reading the chapter and nevermind... (unless she's telling a fictional story so he has no regrets?? ahah...)